Lamp

ABSTRACT

A lamp comprises a housing, a heat sink, a light emitting member, a fan and a blocking ring. The housing includes an outlet section and an inlet section formed on the wall thereof. The heat sink is mounted inside the housing and includes a base plate and a plurality of fins, with the fins being close to the outlet section of the housing and arranged around the base plate to form a chamber. Each of the fins has a first end facing the inlet section of the housing and a second end connecting with the base plate. The light emitting member is fixed to the base plate of the heat sink. The fan is fixed inside the chamber of the heat sink. The blocking ring is mounted inside the housing and between the inlet section and the heat sink and includes an inlet hole aligned with the chamber of the heat sink. By the blocking ring, parts of the heated air flows are blocked from flowing back to the inlet section to avoid turbulence resulting from flowing back air flows. Consequently, the air flows risen by the fan and receiving the heat inside the housing can flow smoothly to out of the housing through the outlet section to enhance heat dissipating efficiency of the heat sink and the fan.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a lamp, more particularly, to a lampthat can automatically dissipate heat generated by the lamp itself.

2. Description of the Related Art

Referring to FIG. 1, a conventional lamp 9 that can dissipate heatgenerated by the lamp 9 itself includes a housing 91 forming a lens 911and a base 912 on two ends thereof respectively, a light emitting member92, a heat sink 93 and a fan 94. The housing 91 has an inlet section 913and an outlet section 914 on the wall thereof between the lens 911 andthe base 912. The light emitting member 92, the heat sink 93 and the fan94 are inside the housing 91, with two ends of the heat sink 93respectively connecting with the housing 91 and the light emittingmember 92. Besides, an outer surface of the heat sink 93 forms aplurality of fins 931 jointly surrounding a chamber 932 that receivesthe fan 94.

In use, the lamp 9 is generally coupled to a lamp holder (notillustrated) set on a wall, ceiling or table, so as to electricallyconnect to a power supply through the base 912 for the light emittingmember 92 to emit light penetrating the lens 911 for illuminating.Furthermore, heat generated by the light emitting member 92 can betransmitted to the fins 931 of the heat sink 93 and then be furthertransmitted to outer spaces of the housing 91 through the outlet section914. In detail, for removing said heat from the lamp 9 to the outerspaces, air flows “A” are generated by the fan 94 and pass through theinlet section 913, gaps between any two adjacent fins 931, and theoutlet section 914 in sequence. Therefore, life of the light emittingmember 92 is extended. Although heat from the light emitting member 92can be dissipated by the heat sink 93 and the fan 94, referring again toFIG. 1, parts of the air flows “A”, designated as “a”, easily flow backto the inlet section 913 through the gaps between any two adjacent fins931 from the chamber 932 after the air flows “A” being risen by the fan94 and flowing through the inlet section 913 and into the chamber 932.Unfortunately, the air flows “a” may block the air flows “A” with theheat from flowing to the outer spaces of the housing 91 through theoutlet section 914 and may cause turbulence near the inlet section 913,and these lower heat dissipating efficiency of the heat sink 93 and thefan 94. As a result, life of the light emitting member 92 of the lamp 9is not extended effectively.

SUMMARY OF THE INVENTION

It is therefore the primary objective of this invention to provide alamp that overcomes the problems of the prior art described above toenhance heat dissipating efficiency.

The present invention solves the problems in the field of lamp byproviding, in a preferred form, a lamp includes a housing, a heat sink,a light emitting member, a fan and a blocking ring. The housing includesa lens and a base on two ends thereof, with an outlet section and aninlet section being formed on the wall of the housing. The heat sink ismounted inside the housing and includes a base plate and a plurality offins, with the fins being close to the outlet section of the housing andarranged around the base plate to form a chamber. Each of the fins has afirst end facing the inlet section of the housing and a second endconnecting with the base plate. The light emitting member is fixed tothe base plate of the heat sink and faces the lens of the housing, withthe light emitting member electrically connecting to the base of thehousing. The fan is fixed inside the chamber of the heat sink. Theblocking ring is mounted inside the housing and between the inletsection and the heat sink and includes an inlet hole aligned with thechamber of the heat sink. By the blocking ring, parts of the heated airflows are blocked from flowing back to the inlet section to avoidturbulence resulting from flowing back air flows. Accordingly, the airflows risen by the fan and receiving the heat inside the housing canflow smoothly to out of the housing through the outlet section toenhance heat dissipating efficiency of the heat sink and the fan.

In an example, an outer diameter of the blocking ring is larger thanthat of the heat sink. Accordingly, a gap letting air flows flow back tothe inlet section after passing by the fins is largely reduced.

In another example, the outer edge of the blocking ring forms a flangeextending in a direction from the first ends to the second ends of thefins for fitting on the outer lateral wall of the fins close to thefirst ends thereof. Accordingly, the convenience of combination betweenthe blocking ring and the heat sink is improved.

In a further example, the blocking ring includes a first flange and asecond flange formed on two opposite sides of the outer edge thereof andextending axially from the outer edge thereof and the housing includinga first shell and a second shell, with the first and second flangescontacting with the first and second shells respectively. Accordingly,the blocking ring is sandwiched and fixed between the first and secondshells, so that the combinations between the blocking ring and the firstand second shells are firm.

In still another example, there is a cushion disposed inside the chamberand the fan is fixed on the cushion. Accordingly, vibration of theoperating fan is reduced to reduce the noise resulting from thevibration.

Further scope of the applicability of the present invention will becomeapparent from the detailed description given hereinafter. However, itshould be understood that the detailed description and specificexamples, while indicating preferable embodiments of the invention, aregiven by way of illustration only, since various will become apparent tothose skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from thedetailed description given hereinbelow and the accompanying drawingswhich are given by way of illustration only, and thus are not limitativeof the present invention, and wherein:

FIG. 1 is a cross sectional view illustrating a conventional lamp;

FIG. 2 is an exploded perspective view illustrating a lamp in accordancewith a first embodiment of the present invention;

FIG. 3 is a cross sectional view illustrating the lamp in accordancewith the first embodiment of the present invention;

FIG. 4 is an exploded perspective view illustrating a lamp in accordancewith a second embodiment of the present invention;

FIG. 5 is a cross sectional view illustrating the lamp in accordancewith the second embodiment of the present invention;

FIG. 6 is an exploded perspective view illustrating a lamp in accordancewith a third embodiment of the present invention; and

FIG. 7 is a cross sectional view illustrating the lamp in accordancewith the third embodiment of the present invention.

In the various figures of the drawings, the same numerals designate thesame or similar parts. Furthermore, when the terms “first”, “second” andsimilar terms are used hereinafter, it should be understood that theseterms are reference only to the structure shown in the drawings as itwould appear to a person viewing the drawings and are utilized only tofacilitate describing the invention.

DETAILED DESCRIPTION OF THE INVENTION

A lamp of a first embodiment according to the preferred teachings of thepresent invention is shown in FIGS. 2 and 3 of the drawings. Accordingto the first embodiment form shown, the lamp includes a housing 1, aheat sink 2, a light emitting member 3, a fan 4 and a blocking ring 5.

The housing 1 is preferred an integrally made hollow housing or ahousing consisting of a plurality of pieces, which is provided forreceiving some related components. In the first embodiment, the housing1 includes a first shell 11 and a second shell 12. The first shell 11has a lens 111 at one end thereof while the other end of the first shell11 forms a first engaging portion 112. An outlet section 113 is formedon the wall of the first shell 11, preferably between the lens 111 andthe first engaging portion 112 and in a shape of plural slots. One endof the second shell 12 forms a second engaging portion 121 for engagingwith the first engaging portion 112 to form the whole housing 1 whilethe other end of the second shell 12 has a base 122. An inlet section123 is formed on the wall of the second shell 12, preferably between thebase 122 and the second engaging portion 121 and also in a shape ofplural slots. Furthermore, a plurality of positioning protrusions 124are formed on the inner surface of the second shell 12 and faces thefirst shell 11 when said first and second shells 11, 12 are assembled,with each positioning protrusion 124 preferably having an axial hole(not labeled).

The heat sink 2 is mounted inside the housing 1 and made of thermallyconductive materials such as aluminum. The heat sink 2 includes a baseplate 21 and a plurality of fins 22 close to the outlet section 113 ofthe housing 1 and arranged around the base plate 21 with intervals toform a chamber 23. Each of the fins 22 has a first end 221 facing theinlet section 123 of the housing 1 and a second end 222 connecting withthe base plate 11. Some of the fins 22 of the heat sink 2 have aplurality of positioning holes 223 at the first ends 221 of the fins 22;furthermore, some of fins 22 with the positioning holes 223 or not havea plurality of through holes 224 with two ends thereof at the first andsecond ends 221, 222 of the fins 22. A plurality of first fixing members24, such as screws, bolts or non-threaded pins, extends through thethrough holes 224, with one end of each first fixing member 24 beingfixed in the axial hole of each positioning protrusion 124 of the secondshell 12, so as to firmly mount the heat sink 2 inside the housing 1.Besides, there is preferably a cushion 25 disposed inside the chamber23.

The light emitting member 3 is preferably selected from a light-emittingdiode (LED), a bulb or any other components that can emit light after anelectric current passes. The light emitting member 3 is fixed to thebase plate 21 of the heat sink 2 and faces the lens 11 of the housing 1,with the light emitting member 3 electrically connecting to the base 122of the housing 1 by plural leads (not illustrated).

The fan 4 is fixed inside the chamber 23 of the heat sink 2 and ispreferably fixed on the cushion 25 for reducing vibration of theoperating fan 4, so as to reduce the noise resulting from the vibration.

The blocking ring 5, which is mounted inside the housing 1 and betweenthe inlet section 123 and the heat sink 2, has an inlet hole 51 alignedwith the chamber 23 of the heat sink 2. Preferably, the inlet hole 51extends axially along a central line of the blocking ring 5.Furthermore, around the inlet hole 51, the blocking ring 5 has aplurality of first through holes 52 for the first fixing members 24 toextend through and a plurality of second through holes 53 for aplurality of second fixing members 54, such as screws, bolts ornon-threaded pins, to extend through. One end of each second fixingmember 54 is fixed in each positioning hole 223 of the heat sink 2, sothat the blocking ring 5 is fixed on the first ends 221 of the fins 22of the heat sink 2. Besides, with reference to FIG. 3, an outer diameterof the blocking ring 5 is preferred larger than that of the heat sink 2,so that a gap letting air flows flow back to the inlet section 123 afterpassing by the fins 22 is largely reduced.

When using the lamp of the present invention, it is coupled to a lampholder (not illustrated) on a wall, ceiling or table with the base 122electrically connecting to a power supply through the lamp holder, sothat the light emitting member 3 emits light penetrating the lens 111for illuminating. Color of the lens 111 can be selected from variouscolors, such as green, yellow, red etc.; hence, the light emittingmember 3 is able to emit the desired color of light through the coloredlens 111. Furthermore, heat generated by the light emitting member 3 canbe transmitted to the fins 22 of the heat sink 2 and then be transferredto outside the housing 1 through the outlet section 113 by air flowswhich flow through the inlet hole 51 of the blocking ring 5 and thenpass through gaps between any two adjacent fins 22, with the fan 4forming air intake through the inlet section 123. Therefore, heatdissipating effect is provided.

Referring again to FIG. 3, while the fan 4 sucks air, air flows passthrough the inlet section 123 and flow into the chamber 23. And theblocking ring 5 is for blocking parts of the heated air flows fromflowing back to the inlet section 123 through the gaps between any twoadjacent first ends 221 of the fins 22 when the heated air passes by thefins 22. Therefore, turbulence near the inlet section 123 is avoidedeffectively and the air flows receiving the heat inside the housing 1can flow smoothly to outer spaces of the housing 1 through the outletsection 113 to enhance heat dissipating efficiency of the heat sink 2and the fan 4, so that life of the light emitting member 3 is extended.

FIGS. 4 and 5 show a lamp of a second embodiment according to thepreferred teachings of the present invention modified from the firstembodiment, which includes a housing 1, a heat sink 2, a light emittingmember 3, a fan 4 and a blocking ring 6, wherein the heat sink 2 iswithout the positioning holes 223. The blocking ring 6 also is mountedinside the housing 1 and between the inlet section 123 and the heat sink2 and has an inlet hole 61 aligned with the chamber 23 of the heat sink2. The blocking ring 6 has a plurality of through holes 62 around theinlet hole 61, for the fixing members 24 to extend through. Preferably,the inlet hole 61 extends axially along a central line of the blockingring 6. Besides, for the convenience of combination between the blockingring 6 and the heat sink 2, the outer edge of the blocking ring 6 formsa flange 63 extending in a direction from the first ends 221 to thesecond ends 222 of the fins 22 to fit on the outer lateral wall of thefins 22 close to the first ends 221 thereof. Hence, the blocking ring 6of the second embodiment of the present invention is able to block partsof the heated air flows from flowing back to the inlet section 123through the gaps between any two adjacent first ends 221 of the fins 22to avoid turbulence near the inlet section 123, such that heatdissipating efficiency of the heat sink 2 and the fan 4 is enhanced.

FIGS. 6 and 7 show a lamp of a third embodiment according to thepreferred teachings of the present invention modified from the firstembodiment, which includes a housing 1, a heat sink 2, a light emittingmember 3, a fan 4 and a blocking ring 7, wherein the heat sink 2 iswithout the positioning holes 223. The blocking ring 7 also is mountedinside the housing 1 and between the inlet section 123 and the heat sink2 and has an inlet hole 71 aligned with the chamber 23 of the heat sink2. The blocking ring 7 has a plurality of through holes 72 around theinlet hole 71, for the fixing members 24 to extend through. Preferably,the inlet hole 71 extends axially along a central line of the blockingring 7. Besides, the blocking ring 7 has a first flange 73 and a secondflange 74 formed on two opposite sides of the outer edge thereof andextending axially from the outer edge thereof. Therefore, the blockingring 7 can be combined with and between the first and second shells 11,12, with the first engaging portion 112 of the first shell 11 contactingwith the first flange 73 of the blocking ring 7 and the second engagingportion 121 of the second shell 12 contacting with the second flange 74of the blocking ring 7 by means of one of close fit, interference fit,screwing and so on. As a whole, the blocking ring 7 is provided forcombining the first and second shells 11, 12 together while the blockingring 7 is sandwiched and fixed between the first and second shells 11,12, so that the combinations between the blocking ring 7 and the firstand second shells 11, 12 are firm. As a result, the blocking ring 7 ofthe third embodiment of the present invention is able to block parts ofthe heated air flows from flowing back to the inlet section 123 throughthe gaps between any two adjacent first ends 221 of the fins 22 toprevent turbulence near the inlet section 123 from occurring, such thatheat dissipating efficiency of the heat sink 2 and the fan 4 isenhanced.

As has been discussed above, the lamp of the present invention providesthe blocking rings 5, 6, 7 which are able to block parts of the heatedair flows from flowing back to the inlet section 123, so that turbulenceresulting from flowing back air flows is avoided. Consequently, the airflows risen by the fan 4 and receiving the heat inside the housing 1 canflow smoothly to out of the housing 1 through the outlet section 113 toenhance heat dissipating efficiency of the heat sink 2 and the fan 4, sothat life of the light emitting member 3 is extended.

Although the invention has been described in detail with reference toits presently preferable embodiment, it will be understood by one ofordinary skill in the art that various modifications can be made withoutdeparting from the spirit and the scope of the invention, as set forthin the appended claims.

1. A lamp, comprising: a housing including a lens and a base on two endsthereof, with an outlet section and an inlet section being formed on thewall of the housing; a heat sink being mounted inside the housing andincluding a base plate and a plurality of fins, with the fins beingclose to the outlet section of the housing and arranged around the baseplate to form a chamber, with each of the fins having a first end facingthe inlet section of the housing and a second end connecting with thebase plate; a light emitting member being fixed to the base plate of theheat sink and facing the lens of the housing, with the light emittingmember electrically connecting to the base of the housing; a fan, beingfixed inside the chamber of the heat sink, and forming air intakethrough the inlet section and moving air to the outlet section; and ablocking ring being mounted inside the housing and between the inletsection and the heat sink and including an inlet hole aligned with thechamber of the heat sink.
 2. The lamp as defined in claim 1, wherein anouter diameter of the blocking ring is larger than that of the heatsink.
 3. The lamp as defined in claim 2, wherein a plurality ofpositioning protrusions are formed on an inner surface of the housing,the blocking ring has a plurality of first through holes around theinlet hole, and some fins of the heat sink have a plurality of throughholes with two ends thereof at the first and second ends, with aplurality of first fixing members extending through the through holesand the first through holes while one end of each first fixing member isfixed in each positioning protrusion of the housing, so as to firmlymount the heat sink inside the housing.
 4. The lamp as defined in claim3, wherein some of the fins of the heat sink have a plurality ofpositioning holes and the blocking ring has a plurality of secondthrough holes around the inlet hole for a plurality of second fixingmembers to extend through, with one end of each second fixing memberbeing fixed in each positioning hole, so that the blocking ring is fixedon the first ends of the fins of the heat sink.
 5. The lamp as definedin claim 1, wherein an outer edge of the blocking ring forms a flangeextending in a direction from the first ends to the second ends of thefins for fitting on an outer lateral wall of the fins close to the firstends thereof.
 6. The lamp as defined in claim 5, wherein a plurality ofpositioning protrusions are formed on an inner surface of the housing,the blocking ring has a plurality of through holes around the inlethole, and some fins of the heat sink have a plurality of through holeswith two ends thereof at the first and second ends, with a plurality offirst fixing members extending through the through holes of the fins andthe through holes of the blocking ring while one end of each firstfixing member is fixed in each positioning protrusion of the housing, soas to firmly mount the heat sink inside the housing.
 7. The lamp asdefined in claim 1, wherein the housing includes a first shell and asecond shell engaging with each other.
 8. The lamp as defined in claim1, wherein there is a cushion disposed inside the chamber and the fan isfixed on the cushion.
 9. A lamp, comprising: a housing including a firstshell having a lens and a first engaging portion disposed at two ends ofthe first shell and a second shell having a second engaging portion anda base disposed at two ends of the second shell, with an outlet sectionbeing formed on a wall of the first shell and an inlet section beingformed on a wall of the second shell; a heat sink being mounted insidethe housing and including a base plate and a plurality of fins, with thefins being close to the outlet section of the housing and arrangedaround the base plate to form a chamber, with each of the fins having afirst end facing the inlet section of the housing and a second endconnecting with the base plate; a light emitting member being fixed tothe base plate of the heat sink and facing the lens of the housing, withthe light emitting member electrically connecting to the base of thehousing; a fan, being fixed inside the chamber of the heat sink, andforming air intake through the inlet section and moving air to theoutlet section; and a blocking ring being mounted inside the housing andbetween the inlet section and the heat sink and including an inlet holealigned with the chamber of the heat sink, a first flange and a secondflange formed on two opposite sides of the outer edge thereof andextending axially from the outer edge thereof, with the first engagingportion of the first shell contacting with the first flange of theblocking ring and the second engaging portion of the second shellcontacting with the second flange of the blocking ring.
 10. The lamp asdefined in claim 9, wherein a plurality of positioning protrusions areformed on the inner surface of the second shell, the blocking ring has aplurality of through holes around the inlet hole, and some fins of theheat sink have a plurality of through holes with two ends thereof at thefirst and second ends, with a plurality of first fixing membersextending through the through holes of the fins and the through holes ofthe blocking ring while one end of each first fixing member is fixed ineach positioning protrusion of the housing, so as to firmly mount theheat sink inside the housing.
 11. The lamp as defined in claim 9,wherein there is a cushion disposed inside the chamber and the fan isfixed on the cushion.